[plants] Haeckel (1866) - plants
   vascular plants see Phylum Tracheophyta Sinnott ex Caval.-Sm. (1998)
     euphyllophytes see Clade Euphyllophyta Lecointre & Le Guyader 2006 [Cantino & Donoghue 2020]
       "Moniliformopses" Kenrick & P.R.Crane (1997), nom. inval. - ferns see Infraphylum Moniliformopses Kenrick & P.R.Crane (1997), nom. inval.
         Class Psilotopsida D.H.Scott (1909) see Subclass Ophioglossidae Klinge (1882)
           Order Ophioglossales Link (1833)
             Family Ophioglossaceae Martinov (1820) - ophioglossoids
               1 Genus Botrychium Sw. (1801) - grapeferns
               2 Genus Helminthostachys Kaulf. (1824)
               3 Genus Mankyua B.Y.Sun, M.H.Kim & C.H.Kim (2002)
               4 Genus Ophioglossum L. (1753) - adder tongues